Operating and Maintenance Instructions – 20
Mnemonic
IEEE 488.1 Function
RL1
remote/local, complete capability
PP0
parallel poll, no capability
DC1
device clear, complete capability
DT0
device trigger, no capability
C0
controller, no capability
E1
electrical interface, open collector drivers
RS232 Interface
RS232 Pin Assignment and Functions
The RS232 pin assignment is shown in Figure 8 and the interface functions are listed in Table
7.
Figure 8: RS232 Pin Assignment
Table 7: RS232 Functions
Name
Symbol
Pin Number
Signal Direction
transmitted data
TxD
2
out
received data
RxD
3
in
request to send
RTS
8
out
clear to send
CTS
7
in
data terminal ready
DTR
6
out
signal ground
SG
5
The data protocol is permanently set to 1200 baud, ASCII character code with eight bits per
character, one stop bit, and no parity bit. The serial port of the controlling computer must be
configured with the same settings. Use a straight-through cable to connect the TB9 grating
filter to the serial port of a DTE (computer).
RS232 Driver Pin Assignment
The RS232 driver pin assignment is shown in Figure 9.
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